Trapezoid area with sides 2.13,2.46,4.22,4.22 equal to 9.678
where a and b are bases, h is height
where m is the middle line, h is the height
where d1,d2 are diagonals, α° is the angle between them
A trapezoid is a quadrilateral whose two sides are parallel (bases) and the other two are not parallel (sides).
Trapezoid area formula 
where a and b are the bases, c and d are the sides
where r is the radius of the inscribed circle, α° is the angle between the base and the sideSolution:
S =
a+b
2
·
√c2 - ()2
(b-a)2+c2-d2
2·(b-a)
=
2.13+2.46
2
·
√4.222 - ()2
(2.46-2.13)2+4.222-4.222
2·(2.46-2.13)
=
4.59
2
·
√4.222 - ()2
0.332+4.222-4.222
2·0.33
=
4.59
2
·
√17.8084 - ()2
0.1089+17.8084-17.8084
0.66
= 2.295
·
√17.8084 - ()2
0.1089
0.66
= 2.295
·
√17.8084 - 0.1652
= 2.295
·
√17.8084 - 0.027225
= 2.295
·
√17.781175
= 2.295
·
4.217
=
9.678
Answer: trapezoid area with sides 2.13,2.46,4.22,4.22 equal to 9.678